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GPS BIIF-1 (PRN 25)
GPS Navigation Satellite (Block IIF, First of Generation) · US Space Force
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GPS BIIF-1 (PRN 25), launched May 2010, was the first satellite of the GPS Block IIF generation — the version that added the L5 signal, a dedicated aviation frequency specifically engineered for 'safety-of-life' applications like aircraft landing guidance, where accuracy and signal integrity genuinely matter to whether a plane lands safely. L5 operates in an internationally protected aviation spectrum band, shielded by regulation from the kind of interference that could affect other GPS frequencies.
Its orbit
- Orbit
- Medium Earth Orbita high vantage point, ideal for navigation
- Altitude
- 12,351–12,734 mi (19,877–20,494 km)
- Inclination
- 54.3°
- One orbit
- 12.0 hours2.0 orbits a day
- NORAD ID
- 36585
- Int’l designator
- 2010-022A
- Launched
- 2010
Orbital elements from CelesTrak, as of 22 Sep 2026.
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